CN111399280B - Display device - Google Patents

Display device Download PDF

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Publication number
CN111399280B
CN111399280B CN202010221021.1A CN202010221021A CN111399280B CN 111399280 B CN111399280 B CN 111399280B CN 202010221021 A CN202010221021 A CN 202010221021A CN 111399280 B CN111399280 B CN 111399280B
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China
Prior art keywords
light
layer
emitting diode
miniature
angle
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CN202010221021.1A
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Chinese (zh)
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CN111399280A (en
Inventor
李富琳
乔明胜
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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Priority to CN202010221021.1A priority Critical patent/CN111399280B/en
Publication of CN111399280A publication Critical patent/CN111399280A/en
Priority to PCT/CN2021/081640 priority patent/WO2021190399A1/en
Priority to PCT/CN2021/081821 priority patent/WO2021190414A1/en
Priority to US17/656,766 priority patent/US11796859B2/en
Priority to US17/656,965 priority patent/US11822183B2/en
Application granted granted Critical
Publication of CN111399280B publication Critical patent/CN111399280B/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention discloses a display device, comprising: the light source comprises a miniature light emitting diode lamp panel and an angle selection layer positioned on the light emergent side of the miniature light emitting diode lamp panel, wherein the angle selection layer reflects light rays in a first incident angle range and transmits the light rays in a second incident angle range, and the incident angle value corresponding to the first incident angle range is smaller than the incident angle value corresponding to the second incident angle range. The light that the reflector layer on the miniature emitting diode lamp plate can reflect back to the angle selective layer carries out diffuse reflection, incides to the angle selective layer again for the light of the second incident angle after the diffuse reflection can transmit, and the light of first incident angle continues to repeat foretell reflection operation, and final even backlight unit's light intensity distribution.

Description

Display device
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
The liquid crystal display screen has the advantages of low power consumption, small size, low radiation and the like as the current mainstream display screen. The liquid crystal display panel is a non-self-luminous panel and needs to be used with a backlight module.
The current direct type backlight module usually uses Light Emitting Diodes (LEDs) as backlight source, and has the advantages of high backlight brightness, and no brightness decrease even after long-time use. The emergent light of the LED is distributed in a Lambert body, and in order to enlarge the light spot irradiation range of the LED, the scheme that the LED is matched with the lens is adopted usually, so that the brightness of the emergent light of the LED at a large angle is improved.
However, the height of the lens used with the LED at present reaches about 5mm, and the ultra-thin backlight design cannot be realized; on the other hand, if the lens is removed, the backlight cannot achieve better uniformity, and in order to improve the uniformity of the backlight, the number of LEDs used has to be greatly increased, which results in an increase in production cost.
Disclosure of Invention
In some embodiments of the invention, an angle selection layer is arranged on a light emergent side of the micro light-emitting diode lamp panel, the angle selection layer reflects light rays in a first incident angle range and transmits light rays in a second incident angle range, and an incident angle value corresponding to the first incident angle range is smaller than an incident angle corresponding to the second incident angle range. The light that the reflector layer on the miniature emitting diode lamp plate can reflect the angle selective layer back carries out the diffuse reflection, incides to the angle selective layer again for the light of the second incident angle after the diffuse reflection can transmit, and the light of first incident angle continues to repeat foretell reflection operation, and final even backlight unit's light intensity distribution.
In some embodiments of the invention, the display device adopts the miniature light-emitting diode lamp panel as the backlight source, so that the overall thickness of the backlight module can be effectively reduced.
In some embodiments of the invention, the angle selection layer comprises a plurality of film layers which are arranged in a laminated manner, and the reflection increasing and reflection reducing effects of light rays are realized by utilizing the thin film interference principle.
In some embodiments of the invention, the first incidence angle range is 0-70 degrees, the second incidence angle range is larger than 70 degrees, the reflection of light rays of 0-70 degrees is increased, and the reflection of light rays above 70 degrees is increased, so that the light intensity distribution of the micro light-emitting diode is uniform.
In some embodiments of the present invention, the reflectivity of the angle selection layer for light rays in the first incident angle range decreases with increasing incident angle, which is beneficial to uniform light intensity distribution of the micro light emitting diode.
In some embodiments of the present invention, the angle-selective layer has a reflectivity of 10% to 80% for light of a first range of incident angles and a reflectivity of less than 10% for light of a second range of incident angles.
In some embodiments of the invention, the surface of the circuit board of the miniature light-emitting diode lamp panel is provided with the reflective layer, so that the miniature light-emitting diode lamp panel has the function of protecting the circuit board and also has the functions of improving the light utilization efficiency and reflecting the light reflected back by the angle selection layer.
In some embodiments of the invention, the display device includes a diffusion layer for further diffusing the emergent light of the micro light emitting diode lamp panel to improve the uniformity of the light.
In some embodiments of the present invention, a vertical distance between the circuit board and the diffusion layer and a distance between two adjacent micro light emitting diodes satisfy: h/p is more than or equal to 0.15 and less than 0.67; wherein h represents the vertical distance from the circuit board to the diffusion layer, and p represents the distance between two adjacent micro light-emitting diodes. The value of h/p in the above range can realize the effects of thinning the backlight module and reducing the number of micro light-emitting diodes.
In some embodiments of the invention, the diffusion layer is positioned on one side of the angle selection layer, which is far away from the miniature light-emitting diode lamp panel, so that the light mixing distance is increased, and the light mixing effect is improved.
In some embodiments of the invention, the diffuser plate is positioned between the angle selection layer and the micro light-emitting diode lamp panel, which is beneficial to realizing a smaller value of h/p.
In some embodiments of the invention, the angle selection layer is attached to the surface of the diffusion layer, so that the use of a support substrate is reduced, and the reduction of the overall thickness is facilitated.
In some embodiments of the invention, the display device comprises a transparent substrate positioned between the miniature light emitting diode lamp panel and the diffusion layer, which is beneficial to increasing the light mixing distance and improving the light mixing effect.
In some embodiments of the invention, the angle selection layer is attached to the surface of the side of the transparent substrate, which is away from the lamp panel of the micro-light-emitting diode, so that the use of the support substrate is reduced, and the reduction of the whole thickness is facilitated.
In some embodiments of the invention, a transparent support is arranged between the micro light-emitting diode lamp panel and the diffusion layer for supporting the diffusion layer, so that a distance is formed between the diffusion layer and the micro light-emitting diode lamp panel, and the light mixing distance is increased.
In some embodiments of the present invention, the stacked film layers are disposed on a substrate, and the substrate has a function of protecting and supporting the stacked film layers.
In some embodiments of the invention, the angle selection layer is configured to: the larger the angle of the incident light, the smaller the reflectivity to the incident light, for improving the backlight uniformity.
In some embodiments of the invention, the angle selection layer is configured to: the greater the angle of the incident light, the greater the transmittance of the incident light for improved backlight uniformity.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of an angle selection layer according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an operation principle of an angle selection layer according to an embodiment of the present invention;
FIG. 5 is a second schematic cross-sectional view of an angle selection layer according to an embodiment of the present invention;
FIG. 6 is a second schematic cross-sectional view illustrating a backlight module according to an embodiment of the present invention;
FIG. 7a is a diagram illustrating the distribution effect of the luminance of the backlight module in the prior art;
FIG. 7b is a diagram illustrating an effect of light distribution of the backlight module according to the embodiment of the present invention;
fig. 8 is a schematic cross-sectional structure diagram of a backlight module according to an embodiment of the invention;
fig. 9 is a schematic cross-sectional structure diagram of a backlight module according to an embodiment of the invention;
fig. 10 is a schematic cross-sectional structure diagram of a backlight module according to an embodiment of the invention;
fig. 11 is a sixth schematic cross-sectional structure view of a backlight module according to an embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
The liquid crystal display mainly comprises a backlight module and a liquid crystal display panel. The liquid crystal display panel does not emit light, and brightness display needs to be realized by a light source provided by the backlight module.
The display principle of the liquid crystal display is that liquid crystal is placed between two pieces of conductive glass, and the electric field effect of liquid crystal molecule distortion is caused by the driving of an electric field between two electrodes so as to control the transmission or shielding function of a backlight source, thereby displaying an image. If a color filter is added, a color image can be displayed.
Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.
Referring to fig. 1, the display device includes: the backlight module 100 is used for providing backlight to the display panel 200, and the display panel 200 is used for displaying images.
The backlight module 100 is generally disposed at the bottom of the display device, and has a shape and size corresponding to those of the display device. When applied to the field of televisions or mobile terminals, the backlight module generally takes a rectangular shape.
The backlight module in the embodiment of the invention adopts the direct type backlight module, is used for uniformly emitting light rays in the whole light emitting surface, and provides light rays with sufficient brightness and uniform distribution for the display panel, so that the display panel can normally display images.
The display panel 200 is located at the light-emitting side of the backlight module 100, and the shape and size of the display panel are generally matched with those of the backlight module. In general, the display panel 200 may be configured in a rectangular shape including a top side, a bottom side, a left side and a right side, wherein the top side is opposite to the bottom side, the left side is opposite to the right side, the top side is connected to one end of the left side and one side of the right side, and the bottom side is connected to the other end of the left side and the other end of the right side.
The display panel 200 is a transmissive display panel, which can modulate the transmittance of light, but does not emit light by itself. The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of light incident to the pixel unit from the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.
Fig. 2 is a schematic cross-sectional structure view of a backlight module according to an embodiment of the invention.
Referring to fig. 2, along the light-emitting direction of the light in the backlight module, the backlight module sequentially includes: a back plate 11, a micro light emitting diode lamp panel 12 and a diffusion layer 13.
The back plate 11 is located at the bottom of the backlight module and has supporting and bearing functions. The back plate 11 is typically a square structure, the shape of which is adapted to the shape of the display device when applied to a profiled display device. The back panel 11 includes a top side, a bottom side, a left side, and a right side. Wherein the antenna side is opposite to the ground side, the left side is opposite to the right side, the antenna side is connected with one end of the left side and one side of the right side respectively, and the ground side is connected with the other end of the left side and the other end of the right side respectively.
In the embodiment of the present invention, the backlight module is a direct type backlight module, and the micro led lamp panel 12 is located on the back plate 11. In general, the whole of the micro led lamp panel 12 may be square or rectangular, with a length of 200mm-800mm and a width of 100mm-500 mm.
According to the size of the display device, a plurality of miniature light-emitting diode lamp panels 12 can be arranged, and backlight is provided between the miniature light-emitting diode lamp panels 12 in a splicing mode. In order to avoid the optical problem caused by splicing the miniature light-emitting diode lamp panels 12, the splicing seams between the adjacent miniature light-emitting diode lamp panels 12 are as small as possible, and even seamless splicing is realized.
The miniature led lamp panel 12 is used as a backlight source, and has a smaller size compared with the conventional led, so that more refined dynamic control can be realized, and the dynamic contrast of the display device is improved.
The miniature led lamp panel 12 specifically includes: a circuit board 121, micro light emitting diodes 122, a light reflecting layer 123 and an encapsulation layer 124.
The circuit board 121 is located on the back plate 11, and the shape of the circuit board 121 is the same as the overall shape of the micro led lamp panel 12. In general, the circuit board 121 has a plate shape, and has a rectangular or square shape as a whole. The length of the circuit board 121 is 200mm-800mm, and the width is 100mm-500 mm.
In the embodiment of the present invention, the Circuit Board 121 may be a Printed Circuit Board (PCB), where the PCB includes an electronic Circuit and an insulating layer, and the insulating layer exposes a pad of the electronic Circuit, on which the micro light emitting diode is soldered, and covers the rest of the electronic Circuit.
Alternatively, the circuit board 121 may also be an array substrate formed by fabricating a thin film transistor driving circuit on a substrate, and the surface of the array substrate has a connection electrode connected to the thin film transistor driving circuit for soldering a micro light emitting diode.
The substrate or the substrate base plate of the above circuit board 121 may be made of a flexible material to form a flexible display device.
The circuit board 121 is used for providing a driving electrical signal for the micro light emitting diode 122. The micro light emitting diode 122 and the circuit board 121 are separately manufactured, the surface of the circuit board 121 includes a plurality of bonding pads for soldering the micro light emitting diode 122, the micro light emitting diode 122 is transferred to the bonding pads after the manufacturing, and the micro light emitting diode 122 is soldered on the circuit board 121 through processes such as reflow soldering, so that the micro light emitting diode 122 can be driven to emit light by controlling an input signal of the circuit board 121.
The micro light emitting diodes 122 are located on the circuit board. The electrodes of the micro leds 122 are soldered to the exposed pads of the circuit board 121, so as to electrically connect the two.
The micro light emitting diode 122 is different from a general light emitting diode, and is specifically referred to as a micro light emitting diode chip. The small size of the micro-leds 122 is advantageous for controlling the dynamic light emission of the backlight module to a smaller sub-area, which is advantageous for improving the contrast of the image. In the present embodiment, the micro-leds 122 have a size of 50 μm to 300 μm.
The micro led lamp panel may include only one color of micro leds 122, and may also include multiple colors of micro leds, which is not limited herein.
The reflective layer 123 is disposed on a surface of the circuit board 121 near the micro light emitting diodes 122. The reflective layer 123 has the same shape as the circuit board 121, and the reflective layer 123 includes a plurality of openings for exposing the micro light emitting diodes 122.
The reflective layer 123 is a protective layer located above the circuit board, and has functions of protecting the circuit board and diffusely reflecting incident light. In the embodiment of the present invention, the light reflecting layer 123 may be coated on the surface of the circuit board 121 by using a material with light reflecting property such as white oil, and then the position of the pad for soldering the micro light emitting diode 122 is exposed by etching or the like.
The reflective layer 123 reflects light, so that light emitted from the micro led lamp panel 122 can be reflected by the reflective layer 123 to the light emitting side again when being reflected to the back plate side by the elements in the backlight module, thereby improving the utilization efficiency of the light source.
The encapsulation layer 124 is located on the surface of the micro light emitting diode 122 facing away from the circuit board 121. The encapsulation layers 124 may be disposed separately from each other or disposed in a single layer. When the two layers are separately arranged, the packaging layer 124 only covers the surface of the micro light-emitting diode 122, and no pattern is arranged in other areas of the circuit board; when the whole layer is disposed, the encapsulation layer 124 covers the whole circuit board 121 and the surface of the micro light emitting diode 122.
The encapsulation layer 124 is used to protect the micro light emitting diode 122 and prevent foreign materials from entering the micro light emitting diode 122. In the embodiment of the present invention, the encapsulation layer 124 may be made of a transparent colloid material, such as silicon gel or epoxy resin. The encapsulation layer 124 may be applied by spot coating or full coating.
The diffusion layer 13 is located on the light-emitting side of the micro led lamp panel 12. The diffusion layer 13 is entirely disposed on the light-emitting side of the micro led lamp panel 12, and the shape of the diffusion layer 13 is the same as that of the micro led lamp panel 12. The diffusion layer 13 may be provided in a rectangular or square shape in a general case.
The diffusion layer 13 functions to scatter incident light, making the light passing through the diffusion layer 13 more uniform. The diffusion layer 13 is provided with scattering particle materials, and light incident to the scattering particle materials can be refracted and reflected continuously, so that the effect of scattering the light is achieved, and the effect of light uniformization is achieved.
The diffusion layer 13 may take the form of a diffusion plate or a diffusion sheet. If the light source is applied to a large display device such as a television, a diffusion plate can be adopted; and when being applied to small-size display device such as cell-phone, intelligent bracelet, can adopt the diffusion piece.
The thickness of the diffusion plate is larger than that of the diffusion plate, and the thickness of the diffusion plate is 1.5mm-3 mm. The diffusion plate has higher haze and more uniform effect, and can be processed by an extrusion process, and the diffusion plate is made of at least one material selected from polymethyl methacrylate (PMMA), Polycarbonate (PC), polystyrene materials (PS) and polypropylene (PP).
The diffusion sheet has a thickness of 0.3mm or less, is relatively thin, and is more suitable for small and light display devices. The diffusion sheet is usually prepared by coating diffusion particles on a substrate, and the substrate may be polyethylene terephthalate PET, glass, or the like, and the diffusion particles may be titanium dioxide, zinc oxide, calcium oxide, or the like.
Referring to fig. 2, a vertical distance h between the diffusion layer 13 and the circuit board 121, also referred to as a light mixing distance (OD), a ratio h/p of the vertical distance h between the diffusion layer 13 and the circuit board 121 to a pitch p between two adjacent micro light emitting diodes 122 may represent an overall thickness of the backlight module, and a relative number of the micro light emitting diodes 122. The smaller the h/p value is, the smaller the light mixing distance is, and the thinner the whole machine is; and the larger the distance between the adjacent micro light-emitting diodes is, the fewer the micro light-emitting diodes need to be used, and the cost is reduced.
In the backlight module using the light emitting diode as the light source, a lens is required to be used, the height of the lens reaches about 5mm, and the h/p value is about 0.3, but the design below OD5mm cannot be realized.
In the embodiment of the invention, the miniature led lamp panel 12 is adopted to reduce the thickness of the backlight module, no lens is arranged on the light-emitting side of the miniature led 122, and the light-emitting intensity of the miniature led 122 is lambertian distribution, which is characterized in that the brightness right above the miniature led 122 is high, and the brightness at the junction of adjacent miniature leds is low. If the uniformity of the backlight is ensured, the h/p value needs to be more than 0.6, for example, about 4 ten thousand micro light emitting diodes are needed for a 65-inch display, and obviously, the cost is high.
In order to overcome the above technical problem, referring to fig. 2, the display device according to the embodiment of the present invention further includes an angle selection layer 14.
The angle selection layer 14 is located on the light-emitting side of the micro led lamp panel 12. In the embodiment of the present invention, the angle selection layer 14 is formed on the light emitting side of the micro led lamp panel 12 in a full-layer arrangement manner. The angle-selecting layer 14 may be prepared by means of optical coating, and may be in the form of an optical film.
The angle selection layer 14 is used for reflecting light rays in a first incident angle range and transmitting light rays in a second incident angle range; and the incident angle value corresponding to the first incident angle range is smaller than the incident angle value corresponding to the second incident angle range.
The incident angle of the light entering the angle selection layer 14 is equal to the emergent angle of the light emitted from the micro light emitting diode 122, so that the first incident angle range corresponds to the emergent angle range with larger emergent light intensity of the micro light emitting diode 122, and the second incident angle range corresponds to the emergent angle range with smaller emergent light intensity of the micro light emitting diode 122.
The angle-selective layer 14 may be chosen to reflect light rays having a small angle of incidence and to transmit light rays having a large angle of incidence. Meanwhile, the light reflected by the angle selection layer 14 can be subjected to diffuse reflection by the reflective layer 123 on the miniature light-emitting diode lamp panel, and then the light is incident on the angle selection layer 14 again, so that the light at the second incident angle after the diffuse reflection can be transmitted, and the light at the first incident angle is continuously subjected to the above reflection operation.
Through the reflection of the light by the angle selection layer 14 and the reflection layer 123, the light intensity in the small angle range directly above the micro light emitting diode 122 can be finally weakened, and the light intensity in the large angle range of the micro light emitting diode 122 at the boundary position can be increased, so that the light of the micro light emitting diode 122 at each exit angle is relatively uniform, and the light-emitting uniformity of the micro light emitting diode lamp panel 12 is improved.
According to the embodiment of the invention, the angle selection layer 14 is arranged on the light emitting side of the miniature light emitting diode lamp panel 12, and the distance between the miniature light emitting diode lamp panel and the angle selection layer 14 is adjusted, so that the h/p value can be in the range of 0.15-0.67, and the requirements of display devices with different specifications are met.
In the embodiment of the present invention, since the light intensity of the micro light emitting diode 122 is larger at the position close to the light emitting center and smaller at the position far from the light emitting center, the first incident angle range corresponds to 0 ° to 70 °, and the second incident angle range corresponds to more than 70 °, such that the angle selection layer 14 can increase the reflection of the incident light of 0 ° to 70 °, and increase the reflection of the incident light of more than 70 °, so that the incident light of the angle range with larger light intensity is reflected, the incident light of the angle range with smaller light intensity is transmitted, and the light intensity distribution is homogenized finally, so that the light intensity difference between the emergent center of the micro light emitting diode and the boundary position is reduced.
Since the light intensity of the micro light emitting diode is higher at the position closer to the emitting center, in the embodiment of the present invention, the reflectivity of the angle selection layer 14 to the light in the first incident angle range is reduced along with the increase of the incident angle, that is, the more the emergent light closer to the emitting center, the more the reflection effect of the angle selection layer 14 to the light is obvious, the more the emergent light closer to the boundary, the more the transmission effect of the angle selection layer 14 to the light is obvious, after the reflected light passes through the cyclic reflection effect of the angle selection layer 14 and the reflection layer 123, the transmission of the small-angle light is reduced, the transmission of the large-angle light is increased, and finally the light intensity homogenization is achieved.
Thus, in an embodiment of the present invention, the angle selection layer 14 is configured to: the larger the angle of the incident light is, the smaller the reflectivity of the incident light is; the greater the angle of the incident ray, the greater the transmittance of the incident ray.
In the embodiment of the present invention, the angle selection layer 14 has a reflectivity of 10% to 80% for light rays in the first incident angle range and a reflectivity of less than 10% for light rays in the second incident angle range. For incident light rays in a first incident angle range, the reflectivity of the angle selection layer 14 to light rays vertically incident to the light-emitting center is set to be highest, and the reflectivity of the angle selection layer 14 to the incident light rays is reduced along with the increase of the incident angle; for incident light rays of the second range of incident angles, the transmittance of the disposed angle selecting layer 14 increases with increasing incident angle.
Fig. 3 is a schematic cross-sectional structure diagram of an angle selection layer according to an embodiment of the present invention.
The angle selection layer includes a plurality of film layers 141 stacked one on another, and refractive indexes of adjacent two film layers 141 are not equal. The film 141 in the angle selection layer can be made of an optical film made of polymer materials such as polyhexafluoropropylene oxide, poly trifluoroethyl acrylate, polymethylhydrosiloxane and the like by adopting an optical coating process.
The thickness of the angle selection layer is 50-60 μm, and is thinner than other optical film layers in the backlight module, so that the influence on the whole thickness of the backlight module is small.
The following description specifically describes the operation principle of the angle selection layer 14 for increasing the reflection of incident light.
Fig. 4 is a schematic diagram of an operating principle of the angle selection layer according to the embodiment of the present invention.
Referring to FIG. 4, when a light ray has an incident angle i, the refractive index n1Is incident on a medium having a refractive index n2On the surface of the film of (2), at n1And n2The interface of the two media reflects and refracts light, the reflecting angle is equal to the incident angle and is still i, and the refracting angle is gamma; when the refracted ray is incident on the lower surface of the film, the reflection and refraction of light can also occur on the lower surface, wherein the reflected ray passes through the upper surface of the film to face the n direction1Refracts in the medium, thereby forming two reflected rays (1) and (2) on the upper and lower surfaces of the film. The optical path difference δ' between the reflected light ray (1) and the reflected light ray (2) is:
Figure BDA0002425134000000111
if the refractive index is n2When the thickness of the film is d and the film has a uniform thickness, the film is formed by
Figure BDA0002425134000000112
And is
Figure BDA0002425134000000113
It is thus possible to obtain:
Figure BDA0002425134000000114
from the law of refraction it follows:
n1sin i＝n2sinγ；
thus, it is possible to obtain:
Figure BDA0002425134000000115
as can be seen from the above formula, if the multilayer film structure is provided, the optical path difference of the reflected light of the light on the upper and lower surfaces of each layer of medium is only related to the refractive index, thickness and incident angle of the layer. In practical applications, light is generally incident into the film from an air medium and is reflected on the upper surface and the lower surface of the film, i.e. the refractive index n of the above formula 11, the above formula can therefore be simplified to:
Figure BDA0002425134000000116
according to the principle of film interference, when the optical path difference of the reflected light beams of the upper surface and the lower surface of the film is integral multiple of the wavelength, the two light beams are coherent and long; when the optical path difference of the reflected light rays of the upper surface and the lower surface is odd times of the half wavelength, the two light rays are coherently cancelled. According to the principle of energy conservation, if the reflected light is coherent and long, the energy of the reflected light is enhanced, and the energy of the transmitted light is weakened; if the reflected light is coherently canceled, the energy of the reflected light is diminished, and the energy of the transmitted light is increased.
When the above-described principle is applied to the embodiment of the present invention, the increased incident angle θ is set for any one of the film layers 141 in the angle selection layer 141And anti-reflection incident angle theta2When the emergent light of the micro light emitting diode 122 is incident on the angle selection layer 14, the incident angle can be made to be theta1The light ray of (2) is increased and reflected to make the incident angle theta1The light is increased in reflection.
Therefore, as long as the refractive index and the thickness of the film layer 141 satisfy the conditions of reflecting the light in the first incident angle range and transmitting the light in the second incident angle range, the same film layer 141 can have the reflection increasing and reflection reducing effects at different incident angles.
The angle selection layer 14 includes a plurality of film layers 141 stacked in a stacked manner, and each film layer 141 may have an anti-reflection effect for a different first incident angle and at the same time have an anti-reflection effect for a second incident angle. By arranging the multilayer film layer 141, reflection increasing effect on light rays within a first incident angle range and reflection increasing effect on light rays within a second incident angle range can be achieved.
In an embodiment of the present invention, the angle selection layer comprises a plurality of film layer groups, wherein each film layer group comprises a plurality of film layers, and the refractive index and the thickness of each film layer are different. If the refractive index of one of the film layers is n1Thickness d1Which acts to reflect 0 deg. incident light and transmit 70 deg. incident light, the following relationship can be derived from the formula derived above:
Figure BDA0002425134000000121
Figure BDA0002425134000000122
the two formulas are divided to obtain:
Figure BDA0002425134000000123
wherein m is a positive integer, and λ is the wavelength of the incident light.
When the refractive index of the material selected for the film layer 141 is determined, the thickness of the film layer 141 can be calculated according to the above, so that the film layer can have a reflection increasing effect on 0 ° incident light and an anti-reflection effect on 70 ° incident light.
Similarly, another film layer can be arranged in the film layer group to increase the reflection of 30-degree incident light, increase the reflection of 80-degree incident light, increase the reflection of 60-degree incident light, increase the reflection of 90-degree incident light, and the like, so that the film layer group can increase the reflection of 0-70-degree incident light and increase the reflection of 70-degree incident light.
By arranging a plurality of film layer groups, the reflection increasing effect of the angle selection layer 14 on the light rays in the first incident angle range and the reflection increasing effect of the angle selection layer on the light rays in the second incident angle range can be enhanced. The adjustment of the reflectivity and the transmissivity can be realized by adjusting the number of the film layers.
Fig. 5 is a second schematic cross-sectional view of an angle selection layer according to an embodiment of the invention.
Referring to fig. 5, the backlight module further includes a substrate 140 for supporting the stacked film layers.
The substrate 140 and the film 141 have the same shape and size, and may be generally configured as a rectangle, the size of which matches the size of the micro led lamp panel 12.
The substrate 140 has a supporting function, the film 141 in the angle selection layer 14 is mostly an optical film with a thickness of nanometer to micrometer, and if the film is formed separately, the film is difficult to assemble in the module assembling process, so the film 141 is formed on the surface of the substrate 140, the substrate 140 and the film 141 are transferred to the corresponding position in the backlight module together, and the substrate 140 also has a certain protection function on the film 141.
The material of the substrate 140 may be polyethylene terephthalate PET, and is not limited herein.
Fig. 6 is a second schematic cross-sectional view illustrating a backlight module according to an embodiment of the invention.
Referring to fig. 2 and 6, the positions of the diffusion layer 13 and the angle selection layer 14 can be flexibly set in the embodiment of the present invention.
As shown in fig. 2, the angle selective layer 14 is located on one side close to the micro led lamp panel 12, and the diffusion layer 13 is located on one side of the angle selective layer 14 away from the micro led lamp panel 12.
The angle selection layer 14 is located between the diffusion layer 13 and the micro led lamp panel 12, which is beneficial to increase the vertical distance between the micro led 122 and the diffusion plate 13, i.e. increase OD, and is beneficial to improve the light mixing effect of the micro led 122.
As shown in fig. 5, the diffusion layer 13 is located on a side close to the micro led lamp panel 12, and the angle selection layer 14 is located on a side of the diffusion layer 13 away from the micro led lamp panel 12.
Diffusion layer 13 is located and is favorable to increasing the distance between angle selection layer 14 and the miniature emitting diode lamp plate 12 between miniature emitting diode lamp plate 12 and the angle selection layer 14, and the distance between the two is big more, then light is after the reflection, and the position when reentrant angle selection layer 14 is also far away, has also increased miniature emitting diode 122's light irradiation scope from this.
However, in the case of fig. 5, the minimum h/p value for achieving good backlight uniformity is larger than in the case where the angle selection layer is provided on the light incident side of the diffusion layer (diffusion plate or diffusion sheet or quantum dot film).
The backlight module in the embodiment of the invention can realize a smaller h/p value on the premise of ensuring uniform backlight, so that the thickness of the whole backlight module is reduced, the use number of micro light-emitting diodes is reduced under the same size, and the cost is controlled.
The invention also carries out comparison test on the brightness distribution condition of the backlight module which does not adopt the angle selection layer in the prior art and adopts the angle selection layer in the embodiment of the invention. When the h/p value is also set to 0.22, the uniformity of the brightness distribution of the backlight module in the embodiment of the invention is remarkably improved.
Fig. 7a shows a schematic diagram of the luminance distribution of the backlight module when the angle selection layer is not used in the prior art, and it can be seen from fig. 7a that many discrete bright spots appear in the backlight module, and a circle of dark regions are formed around the bright spots, and the luminance distribution is not uniform.
Fig. 7b shows a schematic diagram of the brightness distribution of the backlight module after the angle selection layer is adopted in the embodiment of the invention, and as can be seen from fig. 7b, the embodiment of the invention eliminates the brightness through the circular reflection effect of the angle selection layer and the reflective layer in the lamp panel of the micro light-emitting diode, has uniform brightness distribution, and meets the backlight requirement.
The backlight module shown in fig. 2 and 6 can realize the backlight design with small OD value, and the angle selection layer 14 and the diffusion layer 13 are directly arranged on the miniature led lamp panel 12, so that the OD value can be reduced to below 1mm, and the design of the ultrathin module is realized.
The angle selective layer 14 may be directly attached to the surface of the micro led lamp panel 12, so as to omit the substrate 140 and reduce the thickness of the whole.
Alternatively, when the backlight module is applied to a large-sized television or other display device, the diffusion layer 13 may be a diffusion plate, and the angle selection layer 14 may be directly attached to the surface of the diffusion plate, thereby omitting the substrate 140. The diffuser plate functions both as a diffuser and as a support for the angle selection layer 14.
Or, when the backlight module is applied to a display device such as a small-sized mobile terminal, the diffusion layer 13 may be a diffusion sheet, and the angle selection layer may be directly attached to the base material of the diffusion plate, without separately providing a base material for the angle selection layer 14, so that the use of one base material may be omitted, and the diffusion sheet not only has a diffusion function, but also plays a role of supporting the angle selection layer 14.
Alternatively, the angle selection layer 14 may be disposed on the substrate 140 and transferred to a corresponding position of the backlight module together with the substrate. Also the angle-selective layer 14 of the substrate 140 is easier to assemble and avoids damage during assembly.
Fig. 8 is a third schematic cross-sectional view illustrating a backlight module according to an embodiment of the invention.
Referring to fig. 8, in another embodiment of the present invention, the backlight module further includes a transparent substrate 15, and the transparent substrate 15 is located between the micro led lamp panel 12 and the diffusion layer 13.
The shape of the transparent substrate 15 is the same as that of the miniature light-emitting diode lamp panel 12, the miniature light-emitting diode lamp panel 12 adopts a structure that a whole layer is coated with an encapsulation layer, and the transparent substrate 15 is directly placed on the encapsulation layer of the miniature light-emitting diode lamp panel 12. The transparent substrate is made of materials with high transmittance such as polymethyl methacrylate (PMMA) or glass.
The transparent substrate 15 is used as a supporting structure of the diffusion layer 13, so that a certain distance is kept between the micro light emitting diode lamp panel 12 and the diffusion layer 13, light emitted by the micro light emitting diode 122 is sufficiently mixed before reaching the diffusion layer 13, and uniformity of backlight brightness is improved.
The structure of the transparent substrate 15 is arranged above the miniature LED lamp panel 12, and is more suitable for the design of a backlight module with a large OD value.
The angle selection layer 14 can be directly attached on the transparent substrate 15, so that the substrate 140 can be omitted, the number of components used in the backlight module can be reduced, and the thickness can be reduced.
Fig. 9 is a fourth schematic cross-sectional view of a backlight module according to an embodiment of the invention.
Referring to fig. 9, in another embodiment of the present invention, the backlight module further includes a transparent bracket 15 ', and the transparent bracket 15' is located on the micro led lamp panel 12 and is used for supporting the diffusion layer 13.
The micro light emitting diode lamp panel 12 is of a structure of point coating of a packaging material, gaps are formed between adjacent micro light emitting diodes, and the transparent support 15 is arranged at the gap positions and used for supporting the diffusion layer 13, so that a certain distance is pulled between the diffusion plate 13 and the micro light emitting diodes 122, and the light mixing distance OD value is increased.
The angle-selective layer 14 may be directly attached to the surface of the diffusion layer 13, thereby omitting the use of the base material 140, and the diffusion layer may serve as a support for the angle-selective layer.
Fig. 10 is a fifth schematic cross-sectional view of a backlight module according to an embodiment of the invention.
Referring to fig. 10, in the embodiment of the present invention, the backlight module further includes a quantum dot layer 16 and an optical film 17.
The quantum dot layer 16 is located on a side of the diffusion layer 13 away from the micro led lamp panel 12. The quantum dot layer 16 is disposed in a whole layer, and the quantum dot layer 16 has the same shape as the micro led lamp panel 12, and may be disposed in a rectangular or square shape in general.
The quantum dot layer 16 is used in cooperation with a monochromatic micro light emitting diode, in the embodiment of the invention, the micro light emitting diode is a blue light micro light emitting diode, two quantum dot materials are arranged in the quantum dot layer 16, one is a red quantum dot layer material, and the wavelength of excited light of blue light is about 620nm-640 nm; the other is green quantum dot material, and the wavelength excited by blue light is about 520nm-540 nm. The red light and the green light, which are excited and emitted by the quantum dot layer 16, are mixed to transmit the blue light, which is mixed to white light, to provide a backlight for the display panel.
The optical film 17 is located on the side of the quantum dot layer 16 facing away from the diffusion layer 13. The optical film 17 is disposed in a whole layer, and the shape of the optical film 17 is the same as that of the micro led lamp panel 12, and may be generally rectangular or square.
The arrangement of the optical film 17 can make the backlight module adapt to various practical applications.
The optical film 17 may include a prism sheet that can change an exit angle of light, thereby changing a viewable angle of the display device.
The optical film can also comprise a reflective polarizer which is used as a brightness enhancement sheet, can improve the brightness of the backlight module, improves the utilization efficiency of light rays, enables emergent light rays to have polarization properties, and omits the use of a polarizer under a liquid crystal display panel.
Fig. 11 is a sixth schematic cross-sectional view of a backlight module according to an embodiment of the invention.
Referring to fig. 11, in another embodiment of the present invention, the backlight module further includes an antireflection film 18 located on a side of the quantum dot layer 16 facing the micro led lamp panel 12.
The antireflection film 18 functions to increase the transmission of blue light and enhance the reflection of red light and green light, so that light incident on the quantum dot layer 16 is all blue light, the excitation rate of the quantum dot layer 16 is improved, and simultaneously, the red light and the green light emitted to one side of the display panel are both excited by the quantum dot layer 16, and the display panel has a high color gamut.
According to the first invention concept, an angle selection layer is arranged on the light emitting side of the micro light emitting diode lamp panel, the angle selection layer reflects light rays in a first incident angle range and transmits the light rays in a second incident angle range, and the incident angle value corresponding to the first incident angle range is smaller than the incident angle corresponding to the second incident angle range. The light that the reflector layer on the miniature emitting diode lamp plate can reflect the angle selective layer back carries out the diffuse reflection, incides to the angle selective layer again for the light of the second incident angle after the diffuse reflection can transmit, and the light of first incident angle continues to repeat foretell reflection operation, and final even backlight unit's light intensity distribution. The module is thinned by adopting the miniature light-emitting diode lamp panel, the h/p value can be reduced by arranging the angle selection layer on the light-emitting side of the miniature light-emitting diode lamp panel on the premise of ensuring the backlight uniformity, the use number of the miniature light-emitting diodes is reduced, and the cost is reduced.
According to the second inventive concept, the h/p value of the backlight module can be controlled within the range of 0.15-0.67, so as to be suitable for the requirements of display devices with different specifications.
According to the third inventive concept, the light reflecting layer arranged on the micro light emitting diode lamp panel can not only diffuse the light rays in the first incident angle range reflected by the angle selecting layer, but also reflect all the incident light rays, so that the utilization efficiency of the light rays can be improved.
According to the fourth inventive concept, the angle selection layer can play a role in increasing the reflection of incident light rays of 0-70 degrees and increasing the reflection of incident light rays of more than 70 degrees, so that the light intensity in the light-emitting center range of the micro light-emitting diode is transferred to the edge, and the light intensity distribution uniformity is improved.
According to the sixth inventive concept, the reflectivity of the angle selection layer to the light in the first incident angle range is reduced along with the increase of the incident angle, that is, the more the emergent light near the light emitting center position, the more the reflection effect of the angle selection layer to the light is obvious, the more the emergent light near the boundary position, the more the transmission effect of the angle selection layer to the light is obvious, and after the reflected light passes through the circular reflection effect of the angle selection layer and the light reflection layer, the transmission of the large-angle light is reduced, the transmission of the small-angle light is increased, and the homogenization of the light intensity is finally realized.
According to the seventh inventive concept, the angle selection layer includes a plurality of film layers which are stacked, and the reflectivity of the angle selection layer to the light in the first incident angle range is 10% to 80% and the reflectivity to the light in the second incident angle range is less than 10% by adjusting the refractive index, the thickness and the number of the film layers.
According to the eighth inventive concept, the angle selection layer is disposed between the diffusion layer and the micro light emitting diode lamp panel, which is beneficial to increase the vertical distance between the micro light emitting diode and the diffusion plate, i.e., increase the OD, and is beneficial to improve the light mixing effect of the micro light emitting diode.
According to the eighth inventive concept, the diffusion layer is arranged between the micro light-emitting diode lamp panel and the angle selection layer, so that the distance between the angle selection layer and the micro light-emitting diode lamp panel is increased, and the larger the distance between the angle selection layer and the micro light-emitting diode lamp panel is, the farther the position of the light reflected by the light and then incident on the angle selection layer is, and the light irradiation range of the micro light-emitting diode is increased.
According to the ninth inventive concept, the angle selection layer and the diffusion layer are directly arranged on the micro light emitting diode lamp panel, so that the OD value can be reduced to be less than 1mm, and the design of the ultrathin module is realized.
According to the tenth inventive concept, the transparent substrate is arranged between the micro light emitting diode lamp panel and the diffusion layer, so that the micro light emitting diode lamp panel and the diffusion layer are separated by a certain distance, light emitted by the micro light emitting diode is fully mixed before reaching the diffusion layer, and the uniformity of backlight brightness is improved. It is more suitable for the design of backlight module with large OD value.
According to the eleventh invention concept, a transparent bracket is arranged between the panel of the micro light emitting diode and the diffusion layer and used for supporting the diffusion layer, so that a certain distance is reserved between the diffusion layer and the micro light emitting diode, light emitted by the micro light emitting diode is fully mixed before reaching the diffusion layer, and the uniformity of backlight brightness is improved. It is more suitable for the design of backlight module with large OD value.
According to the twelfth inventive concept, the angle selection layer can be directly attached to the surface of the micro light emitting diode lamp panel, so that the base material is omitted, and the thickness is reduced as a whole. Or, when the backlight module is applied to display devices such as large-size televisions, the diffusion layer can be a diffusion plate, and the angle selection layer can be directly attached to the surface of the diffusion plate, so that the base material is omitted. The diffusion plate has a diffusion function and also plays a role in supporting the angle selection layer. Or, when backlight unit is applied to display device such as small-size mobile terminal, the diffusion layer can adopt the diffusion piece, and the angle selection layer can directly be attached on the substrate of diffuser plate, and need not set up the substrate for the angle selection layer alone, can omit the use of a slice of substrate like this, and the diffusion piece not only has the effect of diffusion, plays the effect that supports the angle selection layer again simultaneously. Alternatively, the angle selection layer may be disposed on the substrate and transferred to a corresponding position of the backlight module together with the substrate. And the angle selection layer of the substrate is easier to assemble, and damage in assembly is avoided. Or, in the scheme of adopting the transparent substrate, the angle selection layer can be attached to the surface of the transparent substrate, so that the use of the base material is reduced.
According to the thirteenth inventive concept, the scheme of matching the quantum dot layer with the monochromatic micro light emitting diode is adopted, which is beneficial to improving the color gamut of the display device. One side of quantum dot layer towards miniature emitting diode lamp plate sets up anti-reflection diaphragm, can increase the transmission of blue light, strengthens the reflection of red light and green glow simultaneously, can make the light of inciding into the quantum dot layer be the blue light from this, improves the excitation rate on quantum dot layer, guarantees simultaneously that red light and green glow to display panel one side outgoing are quantum dot layer excitation, have higher colour gamut.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (11)

1. A display device, comprising:
a display panel for image display;
the miniature light-emitting diode lamp panel is used as a backlight source, and the display panel is positioned on the light-emitting side of the miniature light-emitting diode lamp panel; the miniature LED lamp plate includes: the circuit board, the micro light-emitting diode and the reflecting layer; the circuit board is used for providing a driving signal; the micro light-emitting diode is positioned on the circuit board; the light reflecting layer is positioned on the surface of one side of the circuit board close to the micro light-emitting diode, the light reflecting layer comprises an opening for exposing the micro light-emitting diode, and the light reflecting layer is used for performing diffuse reflection on incident light;
the angle selection layer is positioned on the light emitting side of the miniature light emitting diode lamp panel, and is used for reflecting light rays in a first incident angle range and transmitting light rays in a second incident angle range; the incidence angle value corresponding to the first incidence angle range is smaller than the incidence angle value corresponding to the second incidence angle range;
the light reflecting layer and the angle selection layer are used for improving the light emitting uniformity of the miniature diode lamp panel;
the display device further includes:
the diffusion layer is positioned on one side, away from the miniature light-emitting diode lamp panel, of the angle selection layer, or is positioned between the angle selection layer and the miniature light-emitting diode lamp panel;
the vertical distance from the circuit board to the diffusion layer and the distance between two adjacent micro light-emitting diodes satisfy the following relation:
0.15≤h/p<0.67；
wherein h represents the vertical distance from the circuit board to the diffusion layer, and p represents the distance between two adjacent micro light-emitting diodes.
2. The display device of claim 1, wherein the angle selection layer comprises:
the film layers are arranged in a laminated mode, and the refractive indexes of two adjacent film layers are not equal;
the refractive index and the thickness of the film layer meet the conditions of reflecting the light rays in the first incident angle range and transmitting the light rays in the second incident angle range.
3. The display device of claim 1, wherein the first range of incidence angles is between 0 ° and 70 °, and wherein the second range of incidence angles is greater than 70 °.
4. The display device of claim 1, wherein the angle-selective layer has a reflectivity for light rays of the first range of incident angles that decreases with increasing incident angle;
the angle selection layer has a reflectivity of 10% -80% for light rays in the first incident angle range and a reflectivity of less than 10% for light rays in the second incident angle range.
5. The display device of any one of claims 1-4, wherein the micro light emitting diode light panel further comprises:
and the packaging layer is positioned on the surface of one side of the micro light-emitting diode, which is far away from the circuit board.
6. The display device of claim 1, wherein the angle selection layer is attached to a surface of the diffusion layer.
7. The display device of claim 6, further comprising:
the transparent substrate is positioned between the miniature light-emitting diode lamp panel and the diffusion layer and has a supporting function;
the angle selection layer is attached to the surface of one side, away from the miniature light-emitting diode lamp panel, of the transparent substrate.
8. The display device of claim 6, further comprising:
and the transparent support is positioned on the miniature light-emitting diode lamp panel and used for supporting the diffusion layer.
9. The display device according to claim 2, wherein the display device further comprises:
the film layer is arranged on the surface of the base material in a laminated mode.
10. A display device, comprising:
a display panel for image display;
the miniature light-emitting diode lamp panel is used as a backlight source, and the display panel is positioned on the light-emitting side of the miniature light-emitting diode lamp panel; the miniature LED lamp plate includes: the circuit board, the micro light-emitting diode and the reflecting layer; the circuit board is used for providing a driving signal; the micro light-emitting diode is positioned on the circuit board; the light reflecting layer is positioned on the surface of one side of the circuit board close to the micro light-emitting diode, the light reflecting layer comprises an opening for exposing the micro light-emitting diode, and the light reflecting layer is used for performing diffuse reflection on incident light;
the angle selective layer is positioned on the light emitting side of the miniature light-emitting diode lamp panel and is configured to: the larger the angle of the incident light is, the smaller the reflectivity of the incident light is;
the light reflecting layer and the angle selection layer are used for improving the light emitting uniformity of the miniature diode lamp panel;
the display device further includes:
the diffusion layer is positioned on one side, away from the miniature light-emitting diode lamp panel, of the angle selection layer, or is positioned between the angle selection layer and the miniature light-emitting diode lamp panel;
the vertical distance from the circuit board to the diffusion layer and the distance between two adjacent micro light-emitting diodes satisfy the following relation:
0.15≤h/p<0.67；
wherein h represents the vertical distance from the circuit board to the diffusion layer, and p represents the distance between two adjacent micro light-emitting diodes.
11. A display device, comprising:
a display panel for image display;
the miniature light-emitting diode lamp panel is used as a backlight source, and the display panel is positioned on the light-emitting side of the miniature light-emitting diode lamp panel; the miniature LED lamp plate includes: the circuit board, the micro light-emitting diode and the reflecting layer; the circuit board is used for providing a driving signal; the micro light-emitting diode is positioned on the circuit board; the light reflecting layer is positioned on the surface of one side of the circuit board close to the micro light-emitting diode, the light reflecting layer comprises an opening for exposing the micro light-emitting diode, and the light reflecting layer is used for performing diffuse reflection on incident light;
the angle selective layer is positioned on the light emitting side of the miniature light-emitting diode lamp panel and is configured to: the greater the angle of the incident light, the greater the transmittance for the incident light;
the light reflecting layer and the angle selection layer are used for improving the light emitting uniformity of the miniature diode lamp panel;
the display device further includes:
the diffusion layer is positioned on one side, away from the miniature light-emitting diode lamp panel, of the angle selection layer, or is positioned between the angle selection layer and the miniature light-emitting diode lamp panel;
the vertical distance from the circuit board to the diffusion layer and the distance between two adjacent micro light-emitting diodes satisfy the following relation:
0.15≤h/p<0.67；
wherein h represents the vertical distance from the circuit board to the diffusion layer, and p represents the distance between two adjacent micro light-emitting diodes.
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